Is it really the end for Line of Duty? #LineofDuty #LineofDutyFinale H

Line of Duty: H identity revealed in season six finale

Line of Duty has been part of our lives for the past nine years with fans closely following the ongoing investigation into the Organised Crime Group (OCG) and the corrupt police officers working with them. AC-12's DI Steve Arnott (played by Martin Compston), DI Kate Fleming (Vicky McClure) and Detective Superintendent Ted Hastings (Adrian Dunbar) have been at the forefront, leaving no stone unturned in their hunt for bent coppers. However, following the series six finale airing on BBC One, it seems like this could be the end of the line. 

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WARNING: This article contains spoilers from Line of Duty. 

Line of Duty's series six finale aired tonight, Sunday, May 2, on BBC One, where fans found out who the Fourth Man was. 

For the majority of the show, the team have been trying to figure out who are the top corrupt officers working with the OCG. 

Up until now, three had been identified who were DI Matthew Cottan, ACC Derek Hilton and senior legal counsel Gill Biggeloe. 

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The series six finale revealed the Fourth Man in the illicit operation.

READ MORE: Line of Duty fans furious over final ‘H’ twist

Line of Duty: jed mercurio season 6 final seriesLine of Duty: Creator 'confirms' the drama has come to an end. (Image: BBC)

Line of Duty: fourth man h ian buckellsLine of Duty: Ian Buckells was revealed to be the Fourth Man. (Image: BBC)

DC Chloe Bishop (xx) looked through previous police records for anyone who spelt definitely as "definately". 

This was a known trait of H and to AC-12's shock, they discovered it was Detective Superintendent Ian Buckells (Nigel Boyle) who had been behind it all along. 

He continued to call the team "mugs" for not realising it sooner but wasn't laughing when he realised he wasn't able to get immunity or witness protection because of his involvement in the murder of Gail Vela (Andi Osho). 

This meant the storyline which had been running since almost the very beginning of Line of

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